@ ProgramNode (location: (0...52))
├── locals: []
└── statements:
    @ StatementsNode (location: (0...52))
    └── body: (length: 1)
        └── @ CaseNode (location: (0...52))
            ├── predicate:
            │   @ SymbolNode (location: (5...7))
            │   ├── opening_loc: (5...6) = ":"
            │   ├── value_loc: (6...7) = "a"
            │   ├── closing_loc: ∅
            │   └── unescaped: "a"
            ├── conditions: (length: 2)
            │   ├── @ InNode (location: (8...25))
            │   │   ├── pattern:
            │   │   │   @ IfNode (location: (11...20))
            │   │   │   ├── if_keyword_loc: (13...15) = "if"
            │   │   │   ├── predicate:
            │   │   │   │   @ TrueNode (location: (16...20))
            │   │   │   ├── statements:
            │   │   │   │   @ StatementsNode (location: (11...12))
            │   │   │   │   └── body: (length: 1)
            │   │   │   │       └── @ ConstantReadNode (location: (11...12))
            │   │   │   │           └── name: :A
            │   │   │   ├── consequent: ∅
            │   │   │   └── end_keyword_loc: ∅
            │   │   ├── statements:
            │   │   │   @ StatementsNode (location: (23...25))
            │   │   │   └── body: (length: 1)
            │   │   │       └── @ SymbolNode (location: (23...25))
            │   │   │           ├── opening_loc: (23...24) = ":"
            │   │   │           ├── value_loc: (24...25) = "C"
            │   │   │           ├── closing_loc: ∅
            │   │   │           └── unescaped: "C"
            │   │   ├── in_loc: (8...10) = "in"
            │   │   └── then_loc: ∅
            │   └── @ InNode (location: (26...48))
            │       ├── pattern:
            │       │   @ UnlessNode (location: (29...43))
            │       │   ├── keyword_loc: (31...37) = "unless"
            │       │   ├── predicate:
            │       │   │   @ FalseNode (location: (38...43))
            │       │   ├── statements:
            │       │   │   @ StatementsNode (location: (29...30))
            │       │   │   └── body: (length: 1)
            │       │   │       └── @ ConstantReadNode (location: (29...30))
            │       │   │           └── name: :D
            │       │   ├── consequent: ∅
            │       │   └── end_keyword_loc: ∅
            │       ├── statements:
            │       │   @ StatementsNode (location: (46...48))
            │       │   └── body: (length: 1)
            │       │       └── @ SymbolNode (location: (46...48))
            │       │           ├── opening_loc: (46...47) = ":"
            │       │           ├── value_loc: (47...48) = "E"
            │       │           ├── closing_loc: ∅
            │       │           └── unescaped: "E"
            │       ├── in_loc: (26...28) = "in"
            │       └── then_loc: ∅
            ├── consequent: ∅
            ├── case_keyword_loc: (0...4) = "case"
            └── end_keyword_loc: (49...52) = "end"
